Study on Spatial Distribution Pattern of Thrip (Odentot hrips lati) on Alfalfa (Medicago sativa)

紫花苜蓿蓟马的空间格局分析(英文)

[Objective] The aim of this study was to reveal and analyze the spatial distribution pattern of thrip（Odentot hrips lati） on alfalfa（Medicago sativa）.[Method] Within alfalfa plantation areas,experimental plots with the sizes of 10×10,10×20,10×30,20×30,20×40,20×80,30×30,30×40,30×50,40×40,40×50,40×80 and 50×50 m2 respectively were set up in the randomly selected sampling sites of 1 m ×2 m in size.During bud-emerging period and florescence period of alfalfa in the experimental plots,the number of thrips was counted and their distribution pattern was measured using XU Ru-mei＇s method.[Result] During bud-emerging period of alfalfa,the spatial distribution of thrips assumed an elliptic shape sized of 40×30-40×40 cm2 at horizontal level and that presented an ascending-falling trend of tress density down from the top at vertical level.During the florescence period of alfalfa,it showed a homogeneous distribution or randomly distributed pattern at horizontal level and a falling trend of tress density from the top to the apex to the root at vertical level.[Conclusion] Our results provide theoretical basis for field selection of insect-resistant alfalfa varieties.

[目的]对紫花苜蓿蓟马的空间格局进行研究与分析。[方法]在紫花苜蓿种植区内随机取点,设置1×2 m2的样地,在样地内分别设置10×10、10×20、10×30、20×30、20×40、20×80、30×30、30×40、30×50、40×40、40×50、40×80、50×50 cm2尺度的样方,分别在紫花苜蓿现蕾期和开花期调查样方内蓟马数量,并利用徐汝梅等的方法进行空间格局测定。[结果]蓟马在紫花苜蓿现蕾期水平空间分布形状为尺度40×30 ×40×40 cm2的椭圆型,垂直分布表现为由枝条顶端向下密度先增多后又减少的特征;开花期为无性状均匀分布到随机分布的水平空间分布特征,垂直分布表现为由枝条顶端向下递减的特征。[结论]该研究结果为紫花苜蓿抗虫育种的田间选择提供了理论依据。